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Old Tuesday 17th December 2013, 14:34   #1
zeissist
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Question question regarding diopter ring

Hi, I am a new comer here. I have ordered 2 Bushnell binoculars (Natureview 8x32 and Natureview 8x42) and would like to start "bird watching".

I have a question regarding the diopter rings because I find that there is a difference between my two binoculars. As you see in the attached photos, I find that for the 8x32, when I turn the ring all the way to either "+" or "-", I find that the degrees which can be turned is the same on both side. That is, the distances of "A" and "B" are the same.

However, for the 8x42, the dipoter ring can be turned much more to the "-"side. That is, the distance of "D" is longer than "C".

Is it normal or a problem?

Thank you very much.
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Old Tuesday 17th December 2013, 14:37   #2
Pinewood
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Hello Zeissist,

Welcome to the Forum.

I do not think that there may be any problem. I would not worry about it.

Happy bird watching,
Arthur Pinewood
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Old Tuesday 17th December 2013, 14:49   #3
JoeRawles
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It's probably nothing, so long as you can set them up to suit your eyes you needn't adjust them any more. I presume you know how to set them up to match your eyes?

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Old Tuesday 17th December 2013, 16:23   #4
zeissist
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Thanks for your replies. Actually, I did read the instruction manual and know how to make use of the diopter adjustment ring.

I have discovered one thing. I am not sure if the diopter adjustment "zero" is the same for all binoculars. First, I adjusted the 8x32 and found that it was the sharpest when the diopter adjustment was "zero". Then I moved on to the 8x42. Interestingly that it was also the sharpest when the dipoter adjustment was "zero".

Therefore, I believe what I was trying to ask here in the first place that the further "-" could be turned for my 8x42 is not an issue. The index line on the dipoter ring was correctly marked and it is really "zero" when the index line is lined up with the center arrow.
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Old Wednesday 18th December 2013, 13:50   #5
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Quote:
Originally Posted by zeissist View Post

I have discovered one thing. I am not sure if the diopter adjustment "zero" is the same for all binoculars.

It isn't. In a perfect world it should be but in the real world the "zero" diopter setting isn't consistent from one binocular to the next. It is a quality control issue and not necessarily specific to a given price point. I have owned several $1800 units of the same model and found this can be the case as much as it is with $200 units.
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Old Thursday 19th December 2013, 15:06   #6
zeissist
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Quote:
Originally Posted by FrankD View Post
It isn't. In a perfect world it should be but in the real world the "zero" diopter setting isn't consistent from one binocular to the next. It is a quality control issue and not necessarily specific to a given price point. I have owned several $1800 units of the same model and found this can be the case as much as it is with $200 units.
Thanks for your reply. Perhaps it is what the manufacturer can say, "it is absolutely within factory tolerance standard."
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Old Wednesday 1st January 2014, 14:58   #7
zeissist
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I have an update on this story here:
http://www.birdforum.net/showthread....97#post2898997
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Old Wednesday 1st January 2014, 15:57   #8
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Generally, I take diopter adjusment markings with a grain of salt,
unless it's pre-1965.
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